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The NHW20 Prius' 12v accessory outlets each have their own fuse in the
fuse box under the steering column. (Those fuses are sadly easy to
blow.) You'll either have to lay on the floor on the driver's side
and look up, or use a mirror, to see the fuse box location. You'll
have to pull off the panel door to see the fuses. The fuses are
marked in the diagram on the inside of this fuse box cover panel.

You usually need to have the vehicle taken to the dealership so they can perforn the required maintenence. The light being on doesnt mean that there is a problem with anything, it means that the computer knows how many miles are on the car in relation to the manufacturers maintenence schedule. If you absolutely believe you have fixed the problem you can attempt to turn the light off by disconnecting the negative battery cable for 10-15 minutes so the capasitors can discharge. If the computer determines that the maintenence item is not taken care of it will turn the light back on and you will need to take it to Toyota. I hope this helps you, if so would you please mark as solved and leave a rating?

In the rear side panel there is a I believe it is white box that controls the brake lights. Remove the rear panel to gain access to this and check to see if you have voltage input when you have someone hitting the brakes. If so check to see if any voltage is going out. If not than the control box is faulty. Will need to get this from the dealership. Hope this helps. By the way it is the leftside panel I believe. That is where it is in the four door sedan.

this is a traction control fault indicator light. this is most commonly caused by a faulty wheel speed sensor. you'll want to bring the car into the shop to be hooked up to a computer for a proper diagnosis.